My first thought was that is literally the stupidest thing I have ever heard. But that's wrong: the problem here isn't stupidity. The problem here is demonic evil.
Yeah, the devil is not stupid. And demons were once angels; they’ve been around a lot longer, and they’re experts at misleading lesser spirits such as we. The Holy Spirit clearly does not dwell in this “priest”, if he thinks Jesus lacked understanding. He’s missing our only real sure defense against deception.